In:
Review of the Bulgarian Geological Society, Bulgarian Geological Society, Vol. 83, No. 3 ( 2022-12), p. 121-124
Abstract:
Contact Ca-skarns are formed in the marbles of the Malyovitsa Lithotectonic Unit as a result of emplacement of crosscutting pegmatite injections in the area of the Dzhendemski Ezera, NW Rila Mt. Large (up to 4 cm), well-shaped garnet crystals dominate the mineral association with additional vesuvianite, diopside, scapolite and zoisite. Garnets were selected for mineralogical, geochemical and U-Pb geochronological study. Their crystals show clear zonal pattern due to variation in the octahedral position (Fe3+/Al3+), although the overall composition defines grossular predominance (72–95 mol.% grossular; 4–24% andradite). Trace-element signatures reveal constant isomorphic incorporation of P, V, Zn, Ga, Ge and Y, REE, HFSE, U. Results from the in-situ U-Pb dating of the studied skarn materials suggest the timing of pegmatite intrusion onto the metamorphic rocks and marble-hosted skarn formation at 58.37±0.70 Ma.
Type of Medium:
Online Resource
ISSN:
0007-3938
DOI:
10.52215/rev.bgs.2022.83.3
DOI:
10.52215/rev.bgs.2022.83.3.121
Language:
Bulgarian
Publisher:
Bulgarian Geological Society
Publication Date:
2022
detail.hit.zdb_id:
2393611-3
SSG:
13
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